Electrical safety textbook for industrial electricity at college level - Vietnam - Korea Vocational College, Hanoi city

Article 17. Appointment of persons to supervise electrical safety

1. The employer or the operating management unit is responsible for assigning an electrical safety supervisor when the work unit is not specialized in electricity or does not have sufficient electrical safety qualifications to work near electrical objects.

2. The operating management unit is responsible for assigning an electrical safety supervisor when the unit works in a place with special electrical hazards.

Article 18. Work consisting of many work units

In case the work is performed by many working units of the same electricity organization, the employer must appoint a person to lead the work.

Maybe you are interested!

Article 19. Permission to perform tasks alone

Persons assigned to visually inspect lines and equipment are permitted to do so alone. During the inspection, the lines and equipment must always be energized.

Article 21. Responsibilities of the permitting person

1. The permitting person is responsible for checking the full implementation of electrical safety technical measures under his/her responsibility to prepare the workplace for the work unit.

2. Instruct the work unit on the equipment that has been de-energized, the parts of the equipment that are still energized, and special attention measures.

3. Sign the order to allow entry to work and hand over the workplace to the public unit.

work

Article 22. Responsibilities of electrical safety supervisors

1. Accompany the direct supervisor to receive the workplace.

2. Must always be present at the workplace to supervise electrical safety for employees.

work unit and not allowed to do other tasks.

Article 23. Responsibility for coordination

The direct commander must cooperate closely with relevant organizations and command and inspect the work unit to ensure safe work and maintain community safety.

Article 24. Responsibility for inspection

1. The direct commander must clearly understand the assigned work content and safety measures appropriate to the job.

2. The commander is directly responsible

a) Re-check and fully implement necessary safety measures;

b) Compliance with safety regulations by employees of the working unit;

c) Quality of tools and safety equipment used during work;

d) Place, move, and remove electrical safety signs, barriers, and mobile grounding while working and disseminate them to all employees of the work unit.

Article 28. Obligations of employees of work units

1. Must fully understand and comply with safety regulations related to work, must recognize dangerous factors and must be proficient in first aid methods for people with electrical accidents.

2. Must comply with the instructions of the direct commander and do not do anything that the commander does not assign. If the work cannot be performed according to the commander's orders, or if it is found dangerous to perform the work according to the orders, the staff of the work unit must immediately stop working, report and wait for the orders of the direct commander.

3. When unable to comply with the orders of the direct commander, safety regulations or seeing the possibility and signs of unsafety in equipment, safety tools or working conditions, have the right to refuse to carry out the orders of the direct commander, then must report to the appropriate responsible person.

Article 29. Prohibition of entry into dangerous areas

Unit staff are not allowed to enter the following areas:

1. The immediate commander is prohibited from entering.

2. There is a risk of an accident. Article 30. First aid for accident victims

1. Each work unit must have first aid tools for accident victims.

2. When an accident occurs, all employees of the work unit must find a way to provide first aid to the victim and immediately notify the nearest medical facility.

Article 31. Requirements for use

1. All employees of the work unit must properly and fully use safety equipment and labor protection appropriate to the assigned work. The person in charge

The direct commander is responsible for checking the use of safety equipment and labor protection of employees of the work unit.

2. When work is performed near power lines with voltages of 220kV or higher, where there is a risk of electric shock due to static electricity, employees of the work unit must be equipped with specialized protective equipment.

Article 32. Inspection of safety equipment and labor protection

1. Electrical safety equipment and tools must meet testing and usage standards.

2. Safety and labor protection equipment must be inspected and maintained according to the manufacturer's regulations and current legal regulations. It is prohibited to use safety and labor protection equipment that has not been tested, is expired or shows signs of abnormality.

Article 33. Daily inspection

1. Before using safety and labor protection equipment, the user must check and only use it when he is sure that this equipment meets the requirements.

2. After use, safety equipment and labor protection equipment must be cleaned, dried and stored according to regulations. If safety equipment and labor protection equipment shows signs of abnormality, it must be reported to the manager.

Article 34. Use of tools and equipment when working with electricity

The direct commander must require the unit's employees to use tools and equipment for electrical repairs according to the content of the work. It is strictly forbidden to carry out electrical repairs without tools and equipment that ensure safety.

Article 44. Confirming safety measures before starting work Before starting work, the direct commander must confirm the safety measures.

Safety techniques at work have been properly and fully prepared.

Article 50. Checking for power cuts and electrical leakage

When climbing the electric pole, the unit staff must check for no electricity and electric leakage with an electric tester.

Article 54. Working at the column

1. When erecting or lowering columns, necessary measures must be taken to avoid tilting or collapsing the columns.

2. When erecting or lowering poles close to power lines, appropriate measures must be taken to avoid accidents due to violations of the safety distance according to the voltage level of the line.

Article 55. Working with conductors

When pulling or unloading electric cables, the following requirements must be met:

1. Check the condition of support structures and cables to ensure normal operation, collapse prevention measures must be applied to temporary cables, etc.

2. Apply measures to ensure community safety such as placing danger warning signs, stretching ropes or fences to limit dangerous areas, etc. and arranging for lookouts when necessary.

Article 56. Working with electrical equipment

When lifting, lowering or dismantling electrical equipment (such as transformers, switching devices, insulators, etc.), appropriate measures must be taken to avoid falling, collision or accidents due to violation of the safety distance between the equipment and electrical wires or other electrical equipment.

Article 57. Work of digging column foundations and cable trenches

1. When digging column foundations and cable trenches, the work unit must apply appropriate measures to avoid landslides.

2. The working unit must take appropriate measures to prevent people from falling into the pit such as placing barriers, warning lights and arranging lookouts when necessary.

3. Before digging a hole, the work unit must identify underground structures below or near the excavation site and take appropriate measures to avoid accidents or damage to these structures. If unexpected underground structures or damaged underground structures are discovered, the work unit must stop work and report to the responsible person. In case of damage to underground structures causing an accident, the work unit must apply appropriate measures to prevent further accidents and immediately notify relevant organizations.

Article 58. Requirements when suspending work

When work is suspended, safety measures such as mobile grounding, barriers, and warning signals must remain in place during the interruption. If no one remains at the work site at night, the work unit must take appropriate measures to prevent the possibility of accidents. When work is resumed, all safety measures must be re-checked to ensure they are correct and adequate before work begins.

Article 65. Power cut for work

1. When performing the operation of closing or cutting the electrical circuit supplying power to the device, the operator must use appropriate safety equipment.

2. Power outage for work must be carried out so that after power outage the part of the equipment intended for work can be seen to be isolated from energized parts from all sides (except GIS equipment).

Article 66. Working with generators and transformer stations

1. When work is performed on stopped equipment such as generators, synchronous compensators and transformers, all switching devices connected to electrical lines and equipment must be cut off to prevent accidental power surges on the equipment.

2. Generator testing work may be carried out while the generator is rotating without excitation and must be carried out in accordance with approved testing procedures.

Article 67. Flammable materials

1. If there are flammable or explosive substances such as gasoline, oil, gas, hydrogen, or acetylene in or near the work area, the operating management unit and the working unit must coordinate to implement appropriate fire and explosion prevention measures.

2. When the generator and synchronous condenser work with a hydrogen cooling system, explosive mixtures of hydrogen must not be formed. This mixture is explosive when the hydrogen content in the air is from 3.3% to 81.5%.

3. When operating the electrolysis equipment, do not allow explosive mixtures of Hydrogen and Oxygen to form. This mixture is explosive when the Hydrogen component in Oxygen accounts for 2.63% to 95%.

4. Repair work in the oil system and gas system of the generator, hydrogen-cooled compensator, and electrolyzer that has stopped working must take measures to ensure fire and explosion safety such as ventilating the gas system, ventilating the work area, and separating the system from operating systems.

5. Do not do work that involves fire or sparks directly on the generator housing, compensator, electrolyzer or on the pipeline of the oil and gas system containing Hydrogen.

6. Fire-related work such as electric welding, gas welding, etc. can be carried out more than 15m away from the oil and gas system containing Hydrogen. When working less than 15m, special safety measures must be taken such as: placing shields, checking that there is no Hydrogen in the air at the workplace, etc.

7. Fire work in the electrolysis equipment room can be carried out when the equipment is stopped, the air analysis shows that there is no hydrogen and the ventilation system is operating continuously. If it is necessary to carry out fire work on the machinery of another electrolysis equipment that is in operation and cannot be stopped, in addition to the above measures, all pipes connecting the equipment in operation to the pipeline of the repair equipment must be disconnected and plugged. The workplace where there is fire must be covered to prevent sparks from flying around.

Article 68. Working with electric motors

1. When working on a motor without removing the motor from the circuit, lock the motor power supply mechanism, lock the motor control source, and hang a warning sign to avoid accidentally turning the power back on.

2. When working on a motor and removing the motor poles from the power supply circuit, the three-phase short circuit and three-pole mobile grounding of the motor power supply must be installed at the power supply side.

3. The motor's outputs and cable hoppers must be shielded and secured with bolts. Do not remove these shields while the motor is running. Rotating parts of the motor such as the contact ring, flywheel, shaft coupling, and fan must be shielded.

4. Before carrying out work on pump or fan motors, measures must be taken to prevent the motor from rotating backwards.

Article 69. Working with switching equipment

1. Before working with switching equipment with automatic starting and remote control, the following measures must be taken:

a) Separate the control power circuit;

b) Close the valve that supplies compressed air to the circuit breaker compartment or starting mechanism and discharge all air outside;

c) Hang safety signs;

d) Lock the compressed air valve to the cutting machine compartment or remove the valve handle in case of having to work inside the compartment.

2. To test the switching device to calibrate it, allowing temporary energization of the operating circuit, the power circuit of the drive, and the signal circuit without having to complete the handover procedure.

During the test period, the control circuit power supply, gas valve opening, and sign removal shall be performed by the operator or the direct commander (when agreed by the operator).

After the test is completed, if it is necessary to continue working on the switching device, the operator or the direct commander (when agreed by the operator) must take the necessary technical measures to allow the working unit to enter work.

3. Before working in a gas tank, workers must take the following measures:

a) Close all valves of the gas pipeline, lock the valve or remove the valve handle, hang a sign prohibiting operation;

b) Release all gas from the tank and open the vent valve.

4. During operation, all switching operations of the circuit breaker must be controlled remotely. Do not press the operating button located in the control box at the circuit breaker. Only use this operating button to switch the circuit breaker on when it is necessary to prevent an accident or to rescue someone from an electrical accident.

5. It is forbidden to cut off the circuit breaker by the local operation button in case the circuit breaker has been cut off remotely but the circuit breaker has not cut off or has not cut off all poles.

Article 70. Distance when digging soil

1. When digging the ground, construction vehicles such as cars, excavators, etc. must be at least 1.0m away from power cables; vehicles digging the ground using the vibration method must be at least 5.0m away from cables.

2. When digging the ground right on the power cable, first dig a test of the cable to determine the location and depth of the cable under the supervision of the operator. When digging to a depth of 0.40m from the cable, do not use crowbars or hoes, but use shovels to continue digging.

Article 73. Measuring transformers

When working with protective measuring circuits, staff must be careful not to affect the secondary grounding of voltage and current transformers. In particular, current transformers must not be left open on the secondary circuit.

Article 74. Working with battery systems

1. Neutralizer suitable for battery system must be prepared.

2. When working with Acids and Alkali, appropriate measures must be taken such as wearing specialized clothing, eye protection glasses and rubber gloves to protect the body from being affected by Acids and Alkali.

3. Smoking or bringing fire into the battery room is prohibited. The battery room door must be clearly marked “Battery Room - No Fire - No Smoking”.

4. The battery room must be ventilated to prevent poisoning or explosion due to gas generated from the battery system.

Article 75. Work performance order

When performing work in a place where the power has been cut off, the work unit must perform the following sequence:

1. Check and determine if the workplace is out of power.

2. Place the mobile grounding so that the entire work unit is within the grounding protection zone.

3. Portable grounding must be installed on the de-energized equipment on all sides that can bring electricity to the work place.

Article 76. Some regulations on placing and removing mobile grounding

1. The working unit performs the installation and removal of mobile grounding under the direction of the direct commander.

2. When multiple work units perform work directly related to each other, each unit must perform independent mobile grounding.

3. Temporary removal of mobile grounding to perform necessary work of the work unit may only be carried out under the orders of the direct commander and must be re-grounded immediately after completion of that work.

4. When installing and removing mobile grounding, the work unit staff must use poles and insulating gloves.

5. The grounding wire is a soft, multi-strand copper or alloy wire whose cross-section must withstand electrodynamic and thermal effects.